just for the record, this is a thread hijack, and a general issue for all our gas engines, not just MVVS.

The answer is Yes!
A general port reference is possible, and will solve about 80% of the problems. The other 20% are very much dependent on cowl flow properties that a reference port cannot, and will not address. In these cases a venturi port reference may be the solution. See the thread "another GF45i problem"